Power Integrations, Inc.'s (NASDAQ:POWI) price-to-earnings (or "P/E") ratio of 68.6x might make it look like a strong sell right now compared to the market in the United States, where around half of the companies have P/E ratios below 16x and even P/E's below 9x are quite common. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's so lofty.

Recent times haven't been advantageous for Power Integrations as its earnings have been falling quicker than most other companies. It might be that many expect the dismal earnings performance to recover substantially, which has kept the P/E from collapsing. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

What Are Growth Metrics Telling Us About The High P/E?

The only time you'd be truly comfortable seeing a P/E as steep as Power Integrations' is when the company's growth is on track to outshine the market decidedly.

Taking a look back first, the company's earnings per share growth last year wasn't something to get excited about as it posted a disappointing decline of 67%. As a result, earnings from three years ago have also fallen 18% overall. Therefore, it's fair to say the earnings growth recently has been undesirable for the company.

Shifting to the future, estimates from the seven analysts covering the company suggest earnings growth is heading into negative territory, declining 33% over the next year. With the market predicted to deliver 11% growth , that's a disappointing outcome.

With this information, we find it concerning that Power Integrations is trading at a P/E higher than the market. Apparently many investors in the company reject the analyst cohort's pessimism and aren't willing to let go of their stock at any price. Only the boldest would assume these prices are sustainable as these declining earnings are likely to weigh heavily on the share price eventually.

The Final Word

Typically, we'd caution against reading too much into price-to-earnings ratios when settling on investment decisions, though it can reveal plenty about what other market participants think about the company.

We've established that Power Integrations currently trades on a much higher than expected P/E for a company whose earnings are forecast to decline. Right now we are increasingly uncomfortable with the high P/E as the predicted future earnings are highly unlikely to support such positive sentiment for long. Unless these conditions improve markedly, it's very challenging to accept these prices as being reasonable.

Don't forget that there may be other risks. For instance, we've identified 2 warning signs for Power Integrations that you should be aware of.

If you're unsure about the strength of Power Integrations' business, why not explore our interactive list of stocks with solid business fundamentals for some other companies you may have missed.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.